Denial of service in HAProxy



Published: 2019-01-22
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-20615
CWE-ID CWE-125
Exploitation vector Network
Public exploit N/A
Vulnerable software
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HAProxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor HAProxy

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Out-of-bounds read

EUVDB-ID: #VU17107

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-20615

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect frame length validation when processing headers with priority flags set. A remote attacker can send a specially crafted HTTP/2 request, trigger our-of-bounds read and crash the affected application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

HAProxy: 1.8.0 - 1.8.16

External links

http://www.mail-archive.com/haproxy@formilux.org/msg32304.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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